You can wire a GFI in two ways. One way would cause all downstream devices to also trip. Each of those downstream devices would also be GFI protected when wired this way. Or, you can wire it so that only the one outlet is GFI protected and the only one to trip.
On the GFI receptacle, you will see two sets of terminals. One is labeled "Line" and the other is labeled "Load". If you want to have all of the downstream devices to be GFI protected you need to make sure that the correct wires are attached to the "Load" terminals. But, unless you are experienced, hire an electrician to do it. It isn't hard but if you don't know what you are doing you may cause more problems.
Since my tank is a birthday present to my wife, everything I spend going forward is just an extension of my love for her right?